Fire-alarm.



M. MOLONEY.

FIRE ALARM.

APILIOATION FILED FEB. 14, 1912. 1,109,859, Patented sepa 8,1914,

i 4 l lj" f! MATTHEW MOLONEY, OF CHRISTCHURCH, NEW ZEALAND.

FIRE-ALARM.

Specification of Letters Patent.

Application led February 14. 1912. Serial No. 677,593. v

To all w11 om it may concern Be it known that l, MATTHEW MoLoNEY, a citizen of the Dominion of New Zealand, and residing at Christchurch, in the Provincial District of Canterbury, in the Dominion of New Zealand, have invented certain. new and useful Improvements in Improved Fire-Alarms, of which the follow lng is a specification.

This invention relates to that class 'of {ir-e -alarms whiclroperate by closing an electrical circuitby the expansion of metal under heat.

According hereto, the heating of a sleeve causes the withdrawal of a rod against which the short arm of a lever rests, the long arm thus closing an electric alarm circuit and giving warning of an outbreak of fire. The mechanism employed comprises a casing in which is pivoted a bell crank lever The short having a short and a long arm. arm bears against a rod slidable in a sleeve projecting from the casing. The rod is furnished witha nut upon its end whereby the lever may be adjusted with accuracy. The long arm of the level is provided with a. platinum bridge adapted to close upon ccn tact points insulated from the casing and connected to an alarm circuit on one, and to an electric battery on the other side. Heat causes the sleeve to extend 'and withdraw the rod, thus allowing the short arm vof the lever to recede and the bridge on the long arm to touch the contact points, whereupon the electric circuit is closed and a bell or other alarm sounded. The lever is made to fall by gravity, or in other positions is'made to'close the circuit by alspring.

The invention is illustrated in the accompanying drawing wherein Figure 1, is a plan, F i 2, a side elevation,

' Fig. 3, a Section on A- Fig.1.

The bell crank lever having the long arm 1 and short'arm 2 is pivoted at 3 and carries the bridge piece 4 at its outer end, which when the'lever falls is adapted to establish electrical communication between the rtespective Contact points V5 and 6, which are respectively in communication with the terminals 7 and 8 from the electrical bell circuit. The casing 9 has a projecting extension or sleeve 10,'in which is arranged a rod 11 having an adjusting nut 12 screwed upon it at one'end, the nut 12 vhaving a screwed projection 15 which screwsV into a screw threaded aperture in the end of the extension. 10. The rod 11 bears at its other end against the short arm 2 of the lever, thereby normally maintaining it .in such position that the bridge piece is clear of the contact points 5 and 6. The `lot 13 in the end ot' the red 11 permits it to be held if-neecssarvr while the locking nut is being turned to adjust the length of the rod to regulate the distance between the` bridge piede and the Contact points. The normal position of the lever is shown in full lilies in Fig. 2, the rod 11 bearing against the short arm 2 and holding the lever with the bridgepiece l just clear of the contact points 5 and The dotted lines show how the lever may be turned upon its pivot, after removing the cover 1l of the casing, to give access to the contact points. It will be seen that upon extension of the sleeve 10 under the action of heat, the rod 1l is ino-ved outwardly and bell, which may be locatedin any convenient position. v

What I do claim and desire to secure by Letters Patent of the United States is 1. An improved alarm comprising a casing, having a removable cover, a pair of contacts located within said casing, said contactsbeing included in an electric circuit, a lever pivoted in said casing, an ex pansible sleeve secured to the outside of said casing, and a rod secured to the other end of sald sleeve and projecting through said casing into engagement with the lever located therein, said rod, vhen the sleeve expands, being moved out t. engagement. with said lever to allow same to bridge said contacts and close said circuit- Y 2. An improved alarm comprising a casing having a removable cover, a pair of. contacts located within said casing, said contacts being included in an electric circuit, a lever pivoted in said casing, an expansible sleeve secured to the outside of said casing, and a rod secured to the other end of said sleeve and projecting therethrough into engagement with the lever located in said cas- Patented Sept. 8, 1914.,-4

ing, said rod, when the sleeve expands, be-

ing moved out of en agement with said lever to allow same to ridge said contacts and close said circuit.

3. An improved alarm comprising a casing havinga removable cover, a pair of contacts located within said casing, said contacts being included in anyelectric circuit, a lever pivoted in said casing, an expansible sleeve secured to the outside of said casing, a rod secured to thel other end In testimony whereof I have signed my of said sleeve and projecting through said name to this specification in the presence of 5 casing into engagement with the lever lotwo witnesses.

cated therein, said rod when the sleeve ex said sleeve and engaging said screw threads for adjusting the rod relatively to the sleeve.

pands, being moved out of engagement with l MATTHEW MOLONEY' said lever to allow same to bridge said conl/Vitnesses: tacts and close said circuit, screw threads L. G. CAMERON,

10 formed on said rod, and a nut carried by GEORGE A. J. HART. 

